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Apparatus and method for collimating diffused light using a compound holographic optical element

a technology of optical elements and diffused light, applied in the field of apparatus and method for collimating diffused light using a compound holographic optical element, to achieve the effect of simplifying the illustration of the operation

Active Publication Date: 2015-03-10
LUMINIT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration allows for efficient collimation of diffuse light with high diffraction efficiency, maintaining collimation even with minor changes in the playback setup, and can handle both coherent and incoherent light sources, including broadband LEDs, by optimizing the thickness and lamination of holograms and adjusting the diffuser position.

Problems solved by technology

This is impractical because it is defeated if there is even a minor change in the playback setup compared to the recording setup.

Method used

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  • Apparatus and method for collimating diffused light using a compound holographic optical element
  • Apparatus and method for collimating diffused light using a compound holographic optical element
  • Apparatus and method for collimating diffused light using a compound holographic optical element

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Embodiment Construction

[0018]One operable configuration of collimating diffused light with a holographic optical element has the collimated beam after the holographic optical element (HOE) being directed in the same direction as the beam illuminating the diffuser. When manufactured for high efficiency, the holographic optical element can be a thick Bragg hologram otherwise known as a volume hologram. Thick holographic optical elements can have diffraction efficiencies up to 100% theoretically and can efficiently redirect beams in any direction, focusing or defocusing them depending on how the holographic optical elements were recorded. It should be kept in mind that the thick holographic optical elements are wavelength and angle selective. This selectivity limits the amount of the light a holographic optical element can accept for collimation. Decreasing holographic angular or wavelength selectivity to increase the amount of accepted light can be achieved in different ways: for example, by reducing hologr...

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Abstract

A collimator can be made of a compound holographic optical element made of three holographic optical elements. The first reflection holographic optical element will have recorded within it continuous lens configured to receive light from a diffuse light beam and diffract the received light as a first collimated light beam. The second reflection holographic optical element will have recorded within it a regular hologram that is configured to permit the light from the diffuse light source to transmit through it to reach the first reflection holographic element, the second reflection holographic element having within it a second holographically reflective structure configured to receive the first collimated light beam and diffract the first collimated light beam as a second collimated light beam. The third transmission holographic optical element is configured to receive the second collimated light beam and diffract it as a third holographic light beam.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Application No. 61 / 428,929 entitled “Apparatus and Method for Collimating Diffused Light Using a Compound Holographic Optical Element” filed on Dec. 31, 2010.BACKGROUND OF THE INVENTION[0002]Ideal collimation of diffuse incandescent radiation light contradicts the second law of thermodynamics. Lakes, R. S. and Vick, G., “Partial collimation of light from a diffusely reflective source,” adapted from J. Modern Optics, 39, 2113-2119, (1992). Using a simple light baffle it is possible to limit the cone angle of the diffused light, but baffling is not collimation because the baffled rays are not redirected to be congruent with the cone angle, but rather are lost. Nevertheless, at a narrow wavelength bandwidth, or with a coherent light source it is possible to collimate the diffuse light using holograms. A well-known method of collimating light from a diffuser is based on the precise positi...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02B5/32G02B27/30
CPCG02B5/32G02B27/30
Inventor DIMOV, FEDORYIN, KHIN SWEYU, KEVINARIK, ENGINVOLOSCHENKO, DMITRY
Owner LUMINIT
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